1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
zimovet [89]
3 years ago
15

john is twice as old as mary. the sum of their ages is 21. how old is mary? let j = john's age and m = mary's age. select the sy

stem equations that represents the problem.
Mathematics
1 answer:
Verdich [7]3 years ago
3 0
Hello,

let's assume j the john's age, m the mary's age.

<span>"John is twice as old as mary"==>j=2*m
</span>
<span>"the sum of their ages is 21" ==>j+m=21

==>2*m+m=21
==>3m=21
==>m=7
and j=21-7=14

</span>
You might be interested in
The sum of 3 consecutive even number is 270<br>what is thr first number in this sequense​
Alenkasestr [34]

Answer:

the first 3 consecutive numbers

x, x +1, x +2 = 270

x+x+1+x+2 =270

3x +3 =270

collect like terms

3x =270 -3

3x =267

divide both sides by 3

x =89

7 0
3 years ago
point p is located at (x, y). The point is reflected in the y-axis. Point P’s image is located at (__?__)
lesya [120]

Answer:

-x,y?

Step-by-step explanation:

if it's being reflected across the y-axis then that should go in to the negative side of the graph and the same if its being reflected across the x-axis, in which case it would be x,-y

3 0
3 years ago
Read 2 more answers
Sami has 89 video games. He keeps 14 for himself and distributes the remaining video games to each
Natasha2012 [34]

Answer:

89=14-5x

Step by step

Because 14 is how many he keeps and x5 is how many he gives to his cousins in total

5 0
3 years ago
Identify the end behavior of the function f(x) = 6x^4 - 12x^3 +8x -10
goldfiish [28.3K]

Answer:

Step-by-step explanation:

This is a quartic  equation with a positive coefficient for x^4 so it is shaped like an M xo ir rises to both the left and the right.

4 0
3 years ago
Is 36 a factor. yes or no
Leona [35]

Yes because 6x6 is 36


7 0
3 years ago
Read 2 more answers
Other questions:
  • Which expressions are polynomials? Select each correct answer.
    6·2 answers
  • Fred decides that he would rather buy the new refrigerator. How much more will he pay for the new refrigerator than he would for
    7·1 answer
  • There are 820 people at a stadium.65% of them are adults,20% of them are boys,and the rest are girls. How many girls are there a
    9·1 answer
  • How to find instantaneous and average velocity?
    14·1 answer
  • Solve for y. x a = yb
    6·1 answer
  • Write any equation in slope intercept form that has a slope of3/2 and passes through (2,7)
    15·1 answer
  • The sum of three consecutive number is 63 find the number​
    14·1 answer
  • A. 20 mph<br> B. 35 mph<br> C. 70 mph<br> D. 100 mph
    15·2 answers
  • HELP PLEASE!!!!!!!!!!!!!!!!!!!!!!!!!
    7·2 answers
  • What are the zeros of the polynomial function? f(x)=x2−4x−60 Enter your answers in the boxes. The zeros of f(x) are and.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!